NVIDIA PhysX technology is already used in more than 140 shipping titles for Sony PS3, Microsoft Xbox 360, and Nintendo Wii.
Starting today, any owner of a GeForce 8 Series or higher GPU can immediately discover the immersive playability that NVIDIA PhysX technology brings to PC gaming. This first of many planned GeForce Power Packs is a showcase of how PhysX technology is fundamentally changing video games and interactive entertainment.
Available for free from NVIDIA TheForceWithin, the PhysX-enabled content from this first GeForce Power Pack includes: Warmonger, Unreal Tournament 3 PhysX Mod Pack, Nurien social networking service (photo), Metal Knight Zero, Fluid tech demo and The Great Kulu.
In conjunction with the release of the GeForce Power Pack, NVIDIA has also released new WHQL-certified drivers that enable PhysX acceleration for all GeForce 8, 9, and GTX 200 Series GPUs. This new driver also adds support for PhysX-accelerated features in the commercially available Ghost Recon Advanced Warfighter 2 game.
By installing these drivers, GeForce owners can immediately experience much higher levels of interactivity, special effects, and realism on their PC. In addition, GeForce owners will love being able to run PhysX-accelerated applications faster on their GeForce GPU than on competitive GPUs. For example, in the PhysX-enabled levels of Unreal Tournament 3, the GeForce 9800 GTX+ runs 180% faster than on the AMD Radeon HD 4850.
Via this NVIDIA announcement.